A tool and a measuring method for measuring center distance using a mechanical measuring tool

Abstract

The present invention discloses a tool for measuring center distance using a mechanical measuring tool and a measuring method thereof. The tool for measuring center distance using a mechanical measuring tool comprises a main load-bearing rod and a measuring accessory. The measuring accessory is locked with the main load-bearing rod. The measuring accessory comprises a fixed measuring accessory for positioning, an auxiliary measuring accessory for auxiliary positioning and a gauge measuring accessory for measuring. The fixed measuring accessory and the gauge measuring accessory are located at both ends of the main load-bearing rod, and the auxiliary measuring accessory is located between the fixed measuring accessory and the gauge measuring accessory. The beneficial effects of the present invention are simple structure, the main load-bearing rod adopts a hollow carbon fiber diamond rod, the operation is light and labor-saving, and the single-person on-machine detection and accuracy can be ensured, so as to avoid the phenomenon that the center distance of a large workpiece is unqualified after being disassembled from the processing equipment and remeasured, and the workpiece needs to be re-clamped and reprocessed, resulting in low production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of measuring tools, and in particular to a tool for measuring center distance using a mechanical measuring tool and a measuring method thereof. Background Art

[0002] In the prior art, the measurement of the center distance requires measuring the distance between the centers of two different circles on the drawing, and a handheld mechanical measuring tool is used for measurement. The usual method is to find the maximum straight line distance passing through the centers of the two circles, and then subtract the radius of the two circles from the distance, and the result is the center distance. The schematic diagram of the measurement principle of the center distance measuring tool in the prior art is shown in FIG. Figure 1 As shown, how to find the maximum distance passing through the centers of two circles is a key problem that needs to be solved, because the straight line formed by finding the highest point of the arc of the two circles does not necessarily pass through the centers of the two circles, that is, one side of the fixed probe is positioned at a fixed point at a specified arc of one of the circles, and the maximum point where the measuring gauge probe contacts the arc of the other circle is found, wherein the line between the fixed point and the maximum point does not necessarily pass through the centers of the two circles, which means that even if the straight line formed by the highest point between the arcs of the two circles is found, it does not mean that the straight line distance can be used for center distance measurement. The deviation in the measurement process of the center distance measuring tool in the prior art is shown in FIG. Figure 1 , two like Figure 2 , 3 shown.

[0003] The Chinese utility model patent with application number: 201920557790.1 discloses a digital measuring ruler for the center distance of a vehicle wheel set, comprising a main ruler, handles arranged at both ends of the main ruler, a left axle neck ruler frame, a right axle neck ruler frame, a left inner measuring ruler and a right inner measuring ruler arranged between the left and right axle neck ruler frames, a vernier, a digital display arranged on the vernier, and a fastening screw; wherein the left axle neck ruler frame is integrally connected with the main ruler, and the left and right axle neck ruler frames are both provided with measuring claws, and the up and down displacement of the measuring claws is controlled by a knob; the vernier is embedded in the main ruler, and the fixed position is adjusted by a fastening screw; the left and right inner measuring rulers and the right axle neck ruler frame are both fixedly connected with the vernier; the left side of the left axle neck ruler frame and the right side of the right axle neck ruler frame are also symmetrically provided with fixed brackets; the fixed bracket comprises a base and a support rod; wherein the base is in an inverted V shape, one end of the top is integrally connected with the support rod, and a handle is also provided between the other end and the support rod, and they are connected to each other in an approximately right-angle triangle shape; and a Bluetooth wireless transmission device is also provided on the digital display. However, this type of measuring ruler has a relatively complex structure and is only applicable to wheel hubs, but not to other large workpieces. Summary of the invention

[0004] The object of the present invention is to provide a tool for measuring center distance using a mechanical measuring tool and a measuring method thereof.

[0005] To achieve the above purpose, the technical solution proposed by the present invention is:

[0006] The utility model discloses a tool for measuring center distance by using a mechanical measuring tool, comprising a main load-bearing rod and a measuring accessory.

[0007] The measuring accessories are locked to the main load-bearing rod, and include fixed measuring accessories for positioning and / or scale measuring accessories for measuring and / or auxiliary measuring accessories for auxiliary positioning. The fixed measuring accessories and the scale measuring accessories are located at both ends of the main load-bearing rod, and the auxiliary measuring accessories are located between the fixed measuring accessories and the scale measuring accessories.

[0008] The fixed measuring accessory includes a fixed measuring rod and a fixed measuring head. The fixed measuring rod is arranged at the bottom of one end of the main load-bearing rod and is slidably connected to the main load-bearing rod. The fixed measuring head is arranged at the lower part of the fixed measuring rod and passes through the fixed measuring rod. The fixed measuring head is locked to the fixed measuring rod by a locking screw.

[0009] The scale measuring accessory includes a scale measuring rod and a measuring scale. The scale measuring rod is arranged at the bottom of the other end of the main load-bearing rod and is slidably connected to the main load-bearing rod. The measuring scale is arranged at the lower part of the scale measuring rod, and the measuring head of the measuring scale faces outward.

[0010] The auxiliary measuring accessory includes an auxiliary measuring rod, an auxiliary mounting block and an auxiliary measuring head. The auxiliary measuring rod is arranged at the bottom of the main load-bearing rod and is slidably connected to the main load-bearing rod. The auxiliary mounting block is arranged on a side of the auxiliary measuring rod away from the scale measuring rod and is locked with the auxiliary measuring rod. There are two auxiliary measuring heads, which are symmetrically arranged on both sides of the auxiliary mounting block and pass through the auxiliary mounting block. The two auxiliary measuring heads are both arranged parallel to the main load-bearing rod.

[0011] It also includes a locking device for locking the measuring accessory to the main load-bearing rod, the locking device includes a locking block and a locking handle, there are three locking blocks, the three locking blocks corresponding to the measuring accessories are arranged on the outside of the main load-bearing rod and are slidably connected to the main load-bearing rod, the lower inner side of the locking block is fitted with the upper outer side of the corresponding measuring accessory, there are three locking handles, the three locking handles respectively pass through the connection between the three locking blocks and the corresponding measuring accessories, and the locking handles are used to position the measuring accessory at a specified position on the main load-bearing rod.

[0012] It also includes a fixed support device, which includes a fixed support block and a fixed support rod. The fixed support block is arranged on the outside of the fixed measuring rod and is locked with the fixed measuring rod. The fixed support rod is arranged in the middle of the fixed support block and passes through the fixed support block. The fixed support rod is arranged parallel to the main load-bearing rod.

[0013] It also includes a measuring tool support device, which includes a measuring tool support block and a measuring tool support rod. The measuring tool support block is arranged on the outside of the measuring tool measuring rod and is locked with the measuring tool measuring rod. There are two measuring tool support rods, which are symmetrically arranged on both sides of the measuring tool support block and pass through the measuring tool support block. The measuring tool support rod is arranged parallel to the main load-bearing rod.

[0014] It also includes a fine-tuning cross slide with a fine-tuning function. The fine-tuning cross slide is arranged at the lower part of the measuring tool measuring rod and is fixedly connected to the measuring tool measuring rod. The measuring scale is arranged at the lower part of the measuring tool measuring rod through the fine-tuning cross slide.

[0015] The sides of the main load-bearing rod, the fixed measuring rod, the gauge measuring rod and the auxiliary measuring rod are all provided with scale lines for reading.

[0016] A measuring method for the above tool comprises the following steps:

[0017] a. Measure the diameters of the two circles on the workpiece that need to be measured for center distance, which are R1 and R2 respectively;

[0018] b. When the gauge measuring attachment is provided with a gauge support device, place the fixed probe in contact with the arc side wall of one of the circles, and at the same time place the two auxiliary probes in firm contact with the arc side wall of the other circle, place the measuring head of the measuring gauge in contact with the arc side wall of the other circle, and position the fixed probe, auxiliary probe and measuring head of the measuring gauge at the same depth in the two circles, keeping the main bearing rod in a horizontal state. At this time, the main bearing rod passes through the centers of the two circles, and the straight line connecting the arc point of the other circle contacted by the measuring gauge and the arc point of the fixed probe passes through the centers of the two circles;

[0019] When a fine-tuning cross slide is provided on the measuring attachment of the gauge, the fixed probe is brought into contact with the arc side wall of one of the circles, and the two auxiliary probes are brought into firm contact with the arc side wall of the other circle, and the measuring head of the measuring gauge is brought into contact with the arc side wall of the other circle. After the measuring head of the measuring gauge is brought into contact with the arc side wall of the other circle, the measuring head of the measuring gauge is fine-tuned, that is, when the measuring head of the measuring gauge finds the maximum point of the circle in the horizontal direction and does not move in the horizontal direction, fine-tuning is performed in the vertical direction to find the maximum point in the direction. The straight-line distance from the maximum point determined by the horizontal and vertical directions to the fixed probe is the precise value between the farthest ends of the two circles.

[0020] c. Measure the main load-bearing rod 1 and read the distance L1 between the measuring head of the measuring scale and the fixed measuring head. The center distance between the two circles on the workpiece is L1-1 / 2R1-1 / 2R2.

[0021] The beneficial effects of the present invention are:

[0022] The structure is simple, and the main load-bearing rod is a hollow carbon fiber diamond rod. The operation is light and labor-saving, which can ensure the realization of single-person on-machine detection and accuracy. The center distance of large workpieces can be detected by mechanical tools, which solves the dilemma that the center distance measurement of large workpieces can only be carried out by electronic equipment. The detection is accurate and avoids the phenomenon that the center distance of large workpieces is unqualified after being disassembled from the processing equipment and re-measured, and the need for secondary clamping and reprocessing leads to low production efficiency. It is suitable for a variety of large workpieces and is flexible to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the measurement principle of the center distance measuring tool in the prior art;

[0024] Figure 2 This is a schematic diagram of the deviation that occurs during the measurement process of the center distance measuring tool in the prior art. Figure 1 ;

[0025] Figure 3 This is a schematic diagram of the deviation that occurs during the measurement process of the center distance measuring tool in the prior art. Figure 2 ;

[0026] Figure 4 It is a schematic diagram of the overall structure of the first embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the working state of the first embodiment of the present invention;

[0028] Figure 6 It is a schematic diagram of the overall structure of the second embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the working state of the second embodiment of the present invention. Figure 1 ;

[0030] Figure 8 This is a schematic diagram of the working state of the second embodiment of the present invention. Figure 2 .

[0031] In the figure: 1. Main load-bearing rod; 2. Fixed measuring accessories; 3. Gauge measuring accessories; 4. Auxiliary measuring accessories; 5. Fixed measuring rod; 6. Fixed measuring head; 7. Gauge measuring rod; 8. Measuring scale; 9. Auxiliary measuring rod; 10. Auxiliary mounting block; 11. Auxiliary measuring head; 12. Locking block; 13. Locking handle; 14. Fixed support block; 15. Fixed support rod; 16. Gauge support block; 17. Gauge support rod; 18. Fine-tuning cross slide. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0033] Embodiment 1:

[0034] A tool for measuring center distance using a mechanical measuring tool comprises a main load-bearing rod 1 and a measuring accessory, wherein the measuring accessory is locked to the main load-bearing rod 1.

[0035] The measuring attachment includes a fixed measuring attachment 2 for positioning and / or a measuring gauge measuring attachment 3 for measuring and / or an auxiliary measuring attachment 4 for auxiliary positioning. The fixed measuring attachment 2 and the measuring gauge measuring attachment 3 are located at both ends of the main load-bearing rod 1, and the auxiliary measuring attachment 4 is located between the fixed measuring attachment 2 and the measuring gauge measuring attachment 3. The overall structural diagram of the first embodiment of the present invention is shown in FIG. Figure 4 shown.

[0036] The fixed measuring accessory 2 includes a fixed measuring rod 5 and a fixed measuring head 6. The fixed measuring rod 5 is arranged at the bottom of one end of the main load-bearing rod 1 and is slidably connected to the main load-bearing rod 1. The fixed measuring head 6 is arranged at the lower part of the fixed measuring rod 5 and penetrates the fixed measuring rod 5. The fixed measuring head 6 is locked with the fixed measuring rod 5 by a locking screw. The fixed measuring accessory 2 cooperates with the fixed measuring rod 5 and the fixed measuring head 6 to firmly fit with the arc side wall of one of the circles on the workpiece to position one end of the main load-bearing rod 1, wherein the fixed measuring rod 5 is used to provide support for the fixed measuring head 6 while measuring the depth of the fixed measuring head 6 to the upper surface of the workpiece, and the fixed measuring head 6 is used to firmly contact the arc side wall of one of the circles on the workpiece.

[0037] It also includes a fixed support device, which includes a fixed support block 14 and a fixed support rod 15. The fixed support block 14 is arranged on the outside of the fixed measuring rod 5 and is locked with the fixed measuring rod 5. The fixed support rod 15 is arranged in the middle of the fixed support block 14 and passes through the fixed support block 14. The fixed support rod 15 is arranged parallel to the main load-bearing rod 1. The fixed measuring rod 5 is provided with a locking groove corresponding to the fixed support block 14. A locking screw is provided in the middle of the fixed support block 14. One end of the locking screw is located in the locking groove. The fixed support block 14 is locked with the fixed measuring rod 5 through the locking screw. The fixed support device cooperates with the fixed support block 14 and the fixed support rod 15 to provide support for the fixed measuring accessory 2, wherein the fixed support block 14 is used to provide support for the fixed support rod 15, and the fixed support rod 15 is used to overlap the upper surface of the workpiece to provide support for the fixed measuring accessory 2.

[0038] The gauge measuring accessory 3 includes a gauge rod 7 and a measuring scale 8. The gauge rod 7 is arranged at the bottom of the other end of the main load-bearing rod 1 and is slidably connected to the main load-bearing rod 1. The measuring scale 8 is arranged at the lower part of the gauge rod 7, and the measuring head of the measuring scale 8 passes through the lower part of the gauge rod 7 and faces outward. The gauge measuring accessory 3 contacts the arc side wall of another circle on the workpiece through the gauge rod 7 and the measuring scale 8, and at the same time, the straight line connected with the arc points on the fixed probe 6, that is, the main load-bearing rod 1 passes through the two centers of the circle. Among them, the gauge rod 7 is used to provide support for the measuring scale 8 while measuring the depth of the measuring scale 8 to the upper surface of the workpiece. The main load-bearing rod 1 can be kept in a horizontal state by making the depth of the fixed probe 6 and the measuring scale 8 to the upper surface of the workpiece consistent, thereby improving the measurement accuracy and reducing the measurement error. The measuring scale 8 is used to measure the size.

[0039] The auxiliary measuring accessory 4 includes an auxiliary measuring rod 9, an auxiliary mounting block 10 and an auxiliary measuring head 11. The auxiliary measuring rod 9 is arranged at the bottom of the main load-bearing rod 1 and is slidably connected to the main load-bearing rod 1. The auxiliary mounting block 10 is arranged on the side of the auxiliary measuring rod 9 away from the gauge measuring rod 7 and is locked with the auxiliary measuring rod 9. There are two auxiliary measuring heads 11. The two auxiliary measuring heads 11 are symmetrically arranged on both sides of the auxiliary mounting block 10 and penetrate the auxiliary mounting block 10. The two auxiliary measuring heads 11 are arranged parallel to the main load-bearing rod 1. The auxiliary measuring accessory 4 cooperates with the auxiliary measuring rod 9, the auxiliary mounting block 10 and the auxiliary measuring head 11 to assist in fixing the measuring accessory 2 to the main load-bearing rod 1. The main load-bearing rod 1 is positioned to ensure that the main load-bearing rod 1 passes through the centers of the two circles to be measured, wherein the auxiliary measuring rod 9 is used to provide support for the auxiliary mounting block 10 while measuring the depth of the auxiliary measuring head 11 to the upper surface of the workpiece. The main load-bearing rod 1 can be kept horizontal by making the auxiliary measuring head 11 consistent with the fixed measuring head 6 and the depth of the measuring scale 8 to the upper surface of the workpiece. The auxiliary mounting block 10 is used to connect the auxiliary measuring rod 9 and provide installation support for the auxiliary measuring head 11. The two auxiliary measuring heads 11 are equidistantly distributed on both sides of the auxiliary mounting block 10, and are used to cooperate with the fixed measuring head 6 to position the main load-bearing rod 1.

[0040] It also includes a locking device for locking the measuring accessory to the main load-bearing rod 1, the locking device includes a locking block 12 and a locking handle 13, there are three locking blocks 12, the three locking blocks 12 are corresponding to the measuring accessories arranged outside the main load-bearing rod 1 and are slidably connected to the main load-bearing rod 1, the lower inner side of the locking block 12 is fitted with the upper outer side of the corresponding measuring accessory, there are three locking handles 13, the three locking handles 13 respectively pass through the connection between the three locking blocks 12 and the corresponding measuring accessories, the locking handle 13 is used to position the measuring accessory at a specified position on the main load-bearing rod 1, and the locking device is connected to the main load-bearing rod 1. The measuring accessory is locked and positioned through the cooperation of the locking block 12 and the locking handle 13, wherein the locking block 12 is used to connect with the measuring accessory and provide installation support for it, and the locking handle 13 is used to lock the connection between the locking block 12 and the measuring accessory. The locking structure can use a locking screw. For example, the locking screw is passed through the connection between the locking block 12 and the measuring accessory, and the locking handle 13 is rotated to lock the locking block 12 and the measuring accessory at the specified position of the main load-bearing rod 1. Similarly, the locking handle 13 can be rotated to loosen the locking screw to adjust the position of the measuring accessory.

[0041] It also includes a fine-tuning cross slide 18, which is arranged at the lower part of the measuring tool measuring rod and fixedly connected to the measuring tool measuring rod. The measuring scale 8 is arranged at the lower part of the measuring tool measuring rod through the fine-tuning cross slide 18. The fine-tuning cross slide 18 is used to reduce the influence of errors on the center distance measurement.

[0042] During measurement, the meter measuring attachment 3 and the auxiliary measuring attachment 4 are located in the same circle to be measured, and the fixed measuring attachment 2 is located in another circle to be measured, so that the center distance between the two circles to be measured can be measured. The working state diagram of the first embodiment of the present invention is shown in FIG. Figure 5 shown.

[0043] The sides of the main load-bearing rod 1, the fixed measuring rod 5, the gauge measuring rod 7 and the auxiliary measuring rod 9 are all provided with scale lines for reading, and reading can be performed through the scale lines.

[0044] The main load-bearing rod 1 adopts a hollow carbon fiber diamond rod structure.

[0045] Embodiment 2:

[0046] The fine-tuning cross slide 18 with fine-tuning function in the first embodiment is replaced by a measuring tool support device, which includes a measuring tool support block 16 and a measuring tool support rod 17. The measuring tool support block 16 is arranged on the outside of the measuring rod 7 and is locked with the measuring rod 7. There are two measuring tool support rods 17, which are symmetrically arranged on both sides of the measuring tool support block 16 and penetrate the measuring tool support block 16. The measuring tool support rod 17 is arranged parallel to the main load-bearing rod 1, and the measuring rod 7 is provided with a locking groove corresponding to the measuring tool support block 16. A locking screw is provided in the middle of the gauge support block 16, one end of the locking screw is located in the locking groove, the gauge support block 16 is locked with the gauge measuring rod 7 through the locking screw, and the gauge support device cooperates with the gauge support block 16 and the gauge support rod 17 to provide support for the gauge measuring accessory 3, wherein the gauge support block 16 is used to provide installation support for the gauge support rod 17, and the gauge support rod 17 is used to overlap the upper surface of the workpiece to provide support for the gauge measuring accessory 3. The overall structural schematic diagram of the second embodiment of the present invention is shown as follows Figure 6 shown.

[0047] When a measuring tool support device is provided, when measuring the center distance of two circles on the workpiece, it is necessary to abut the fixed probe 6 against the arc side wall of one of the circles, and at the same time, the two auxiliary probes 11 are firmly in contact with the arc side wall of the other circle, and the measuring head of the measuring scale 8 is abutted against the arc side wall of the other circle. The fixed probe 6, the auxiliary probe 11 and the measuring head of the measuring scale 8 are positioned at the same depth in the two circles, and the main load-bearing rod 1 is kept in a horizontal state. At this time, the main load-bearing rod 1 passes through the centers of the two circles, and the straight line connecting the arc point of the other circle contacted by the measuring scale 8 and the arc point of the fixed probe 6 passes through the centers of the two circles. The working state diagram of the second embodiment of the present invention Figure 1 like Figure 7 shown.

[0048] A method for measuring a tool using a mechanical measuring tool to measure a center distance comprises the following steps:

[0049] a. Measure the diameters of the two circles on the workpiece that need to be measured for center distance, which are R1 and R2 respectively;

[0050] b. When a measuring tool support device is provided on the gauge measuring attachment 3, that is, the technical solution of the first embodiment, the fixed probe 6 is brought into contact with the arc side wall of one of the circles, and the two auxiliary probes 11 are firmly brought into contact with the arc side wall of the other circle, and the measuring head of the measuring gauge 8 is brought into contact with the arc side wall of the other circle, and the fixed probe 6, the auxiliary probe 11 and the measuring head of the measuring gauge 8 are positioned at the same depth in the two circles, and the main bearing rod 1 is kept in a horizontal state. At this time, the main bearing rod 1 passes through the centers of the two circles, and the straight line connecting the arc point of the other circle contacted by the measuring gauge 8 and the arc point of the fixed probe 6 passes through the centers of the two circles;

[0051] When the gauge measuring attachment 3 is provided with a fine-tuning cross slide 18, that is, the technical solution of the second embodiment, the fixed probe 6 is brought into contact with the arc side wall of one of the circles, and the two auxiliary probes 11 are firmly brought into contact with the arc side wall of the other circle, and the measuring head of the measuring gauge 8 is brought into contact with the arc side wall of the other circle. After the measuring head of the measuring gauge 8 is brought into contact with the arc side wall of the other circle, the measuring head of the measuring gauge 8 is fine-tuned, that is, when the measuring head of the measuring gauge 8 finds the maximum point of the circle in the horizontal direction and no longer moves in the horizontal direction, fine-tuning is performed in the vertical direction to find the maximum point in the direction. The straight-line distance from the maximum point determined by the horizontal direction and the vertical direction to the fixed probe is the precise value between the farthest ends of the two circles.

[0052] c. Measure the main load-bearing rod 1 and read the distance L1 between the measuring head of the measuring scale 8 and the fixed measuring head 6. The center distance between the two circles on the workpiece is L1-1 / 2R1-1 / 2R2.

[0053] Working state diagram of the second embodiment of the present invention Figure 2 like Figure 8 shown.

[0054] The beneficial effects of the present invention are that the structure is simple, and the main load-bearing rod 1 adopts a hollow carbon fiber diamond rod, which is easy and labor-saving to operate, can ensure the realization of single-person on-machine detection and accuracy, and can use mechanical tools to detect the center distance of large workpieces, solving the current dilemma that the center distance measurement can only be carried out by electronic equipment. The detection is accurate, and it avoids the phenomenon that the center distance of large workpieces is unqualified after being disassembled from the processing equipment and re-measured, and the need for secondary clamping and reprocessing leads to low production efficiency. It is suitable for a variety of large workpieces and is flexible to use.

[0055] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A tool for measuring center distance using a mechanical measuring tool, comprising a main load-bearing rod (1), characterized in that: It also includes a measuring accessory, which is locked to the main load-bearing rod (1); The measuring accessories include a fixed measuring accessory (2) for positioning, a gauge measuring accessory (3) for measuring, and an auxiliary measuring accessory (4) for assisting positioning, wherein the fixed measuring accessory (2) and the gauge measuring accessory (3) are located at two ends of the main load-bearing rod (1), and the auxiliary measuring accessory (4) is located between the fixed measuring accessory (2) and the gauge measuring accessory (3); The fixed measuring attachment (2) comprises a fixed measuring rod (5) and a fixed measuring head (6), wherein the fixed measuring rod (5) is arranged at the bottom of one end of the main load-bearing rod (1) and is slidably connected to the main load-bearing rod (1), and the fixed measuring head (6) is arranged at the lower part of the fixed measuring rod (5) and passes through the fixed measuring rod (5), and the fixed measuring head (6) is locked with the fixed measuring rod (5) by a locking screw; The gauge measuring accessory (3) comprises a gauge measuring rod (7) and a measuring gauge (8), wherein the gauge measuring rod (7) is arranged at the bottom of the other end of the main load-bearing rod (1) and is slidably connected to the main load-bearing rod (1), and the measuring gauge (8) is arranged at the lower part of the gauge measuring rod (7), and the measuring head of the measuring gauge (8) faces outward; The auxiliary measuring accessory (4) comprises an auxiliary measuring rod (9), an auxiliary mounting block (10) and an auxiliary measuring head (11); the auxiliary measuring rod (9) is arranged at the bottom of the main load-bearing rod (1) and is slidably connected to the main load-bearing rod (1); the auxiliary mounting block (10) is arranged on a side of the auxiliary measuring rod (9) away from the gauge measuring rod (7) and is locked to the auxiliary measuring rod (9); there are two auxiliary measuring heads (11); the two auxiliary measuring heads (11) are symmetrically arranged on both sides of the auxiliary mounting block (10) and penetrate the auxiliary mounting block (10); and the two auxiliary measuring heads (11) are arranged parallel to the main load-bearing rod (1); It also includes a fine-tuning cross slide (18) with a fine-tuning function, the fine-tuning cross slide (18) being arranged at the lower part of the measuring rod (7) and fixedly connected to the measuring rod (7), and the measuring scale (8) being arranged at the lower part of the measuring rod (7) via the fine-tuning cross slide (18); The sides of the main load-bearing rod (1), the fixed measuring rod (5), the gauge measuring rod (7) and the auxiliary measuring rod (9) are all provided with scale lines for reading; It also includes a measuring tool support device, which includes a measuring tool support block (16) and a measuring tool support rod (17), wherein the measuring tool support block (16) is arranged outside the measuring rod (7) and is locked with the measuring rod (7), and there are two measuring tool support rods (17), which are symmetrically arranged on both sides of the measuring tool support block (16) and penetrate the measuring tool support block (16), and the measuring tool support rod (17) is arranged parallel to the main load-bearing rod (1); The method for measuring the center distance of a tool using a mechanical measuring tool comprises the following steps: a. Measure the diameters of the two circles on the workpiece that need to be measured for center distance, which are R1 and R2 respectively; b. When the gauge measuring attachment (3) is provided with a measuring tool support device, the fixed probe (6) is brought into contact with the arc side wall of one of the circles, and the two auxiliary probes (11) are firmly brought into contact with the arc side wall of the other circle, and the measuring head of the measuring gauge (8) is brought into contact with the arc side wall of the other circle, and the fixed probe (6), the auxiliary probe (11) and the measuring head of the measuring gauge (8) are positioned at the same depth in the two circles, and the main bearing rod (1) is kept in a horizontal state. At this time, the main bearing rod (1) passes through the centers of the two circles, and the straight line formed by connecting the arc point of the other circle contacted by the measuring gauge (8) and the arc point of the fixed probe (6) passes through the centers of the two circles; When the gauge measuring attachment (3) is provided with a fine-tuning cross slide (18), the fixed probe (6) is brought into contact with the arc side wall of one of the circles, and the two auxiliary probes (11) are brought into firm contact with the arc side wall of the other circle, and the measuring head of the measuring gauge (8) is brought into contact with the arc side wall of the other circle. After the measuring head of the measuring gauge (8) is brought into contact with the arc side wall of the other circle, the measuring head of the measuring gauge (8) is fine-tuned, that is, when the measuring head of the measuring gauge (8) finds the maximum point of the circle in the horizontal direction and does not move in the horizontal direction, fine-tuning is performed in the vertical direction to find the maximum point in the direction. The straight-line distance from the maximum point determined by the horizontal direction and the vertical direction to the fixed probe is the accurate value between the farthest ends of the two circles. c. Measure the main bearing rod (1) and read the distance L1 between the measuring head of the measuring scale (8) and the fixed measuring head (6). The center distance between the two circles on the workpiece is L1-1 / 2R1-1 / 2R2.

2. A tool for measuring center distance using a mechanical measuring tool as claimed in claim 1, characterized in that: It also includes a locking device for locking the measuring accessory with the main load-bearing rod (1), the locking device including a locking block (12) and a locking handle (13), there are three locking blocks (12), the three locking blocks (12) are arranged outside the main load-bearing rod (1) corresponding to the measuring accessories and are slidably connected to the main load-bearing rod (1), the lower inner side of the locking block (12) is arranged to fit the upper outer side of the corresponding measuring accessory, there are three locking handles (13), the three locking handles (13) respectively penetrate the connection between the three locking blocks (12) and the corresponding measuring accessories, and the locking handles (13) are used to position the measuring accessory at a specified position on the main load-bearing rod (1).

3. A tool for measuring center distance using a mechanical measuring tool as claimed in claim 1, characterized in that: It also includes a fixed support device, which includes a fixed support block (14) and a fixed support rod (15), wherein the fixed support block (14) is arranged outside the fixed measuring rod (5) and is locked with the fixed measuring rod (5), and the fixed support rod (15) is arranged in the middle of the fixed support block (14) and passes through the fixed support block (14), and the fixed support rod (15) is arranged parallel to the main load-bearing rod (1).

Images